Go to my powerbasic source page at
http://www.mindspring.com/~johnecarter and download JCOM for a simple
communications program that can talk to the modem, do screen display
in half- or full duplex, and do simple (ASCII, no error checking) file
transfers.  For something more complex, the DLOADCC program implements
the protocol that was used to transfer programs to the Radio Shack
Color Computer via its serial port, including the ability to write and
download a CoCo BASIC program on demand to display a list of the files
on the PC serving as the host.

Also follow the links to other sites in the Source Site Ring.

John C